设等差数列{an}的前n项和为Sn,若S3=6,S6=3,则S9=( )
A.0 | B.-9 | C.-6 | D.-3 |
19-20高一下·江西南昌·阶段练习 查看更多[1]
(已下线)江西省南昌市新建二中2019-2020学年高一下学期3月月考数学试题
更新时间:2020-04-16 12:55:52
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【知识点】 等差数列片段和的性质及应用
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【推荐1】已知等差数列
的前n项和为
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9bd62102a31b24a3b648f417dfb699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97dd5cf477848d20e1ff26353f4614a7.png)
A.8 | B.12 | C.14 | D.20 |
您最近一年使用:0次
单选题
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容易
(0.94)
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【推荐2】设等差数列
的前
项和为
,若
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c9b5080aa2e9c889aac8e378d83dfee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38db0637b08ba3fb6a230f8e08ba438f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d84adcf862cb7057595c4b9cbf6800.png)
A.20 | B.10 |
C.40 | D.30 |
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